10 hours but i just went through it quickly as possible plus i left the game running for about 1hour by accident was in a hurry :PI restarted and got all the stages with the crown so im 100% complete those stages and its on hard im 86% BTW: hard seems to be easier then normal if that makes any sense lol

After I beat Tabuu it was around 8 hours, then I went back and tried getting all the stages complete and am around 9 hours or so now. Probably take me another hour to find all the different trophies and what not, oh well something to look forward to later on.

I think around 8:45 including unlocking secret characters Wolf and Toon Link (Jiggly I beat classic mode for). Was fun :3 the great maze was sorta annoying but I think it's only because I was rushing and wanted things done.